Wireless-telegraph transmitter.



G. MARCONI. wmuass TELEGRAPH mmsmmm. APPLICATION FILED APR. 30. UN.

1 ,271;1 90. Patented July 2. 1918.

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lllllllllmllflfillllilll!|I G. MARCONI. WIRELESS IELEGRAPH TRANSMHTER. APPLICATION FILED APR. 30. I914.

1 ,271,1 90. Patented July 2, 1018.

3 SHEETS-SHEET 2.

3 F-llllllllllflfllllMIMI G. MARCUNI. WIRELESS TELEGRAPH TRANSMITTER. "memos mm m. 30. um.

wmn'inm WM MM Patented July 2, 1918.

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WIRELESS-TELEGRAPH TRANSMITTER.

Specification 01 Letter: Patent.

Patented July 2, 1918.

Application tllcd April 30. 1914. Serial No. 885.845.

To all whom it may concern:

flic'it known that l, til'oLmmlo Mam'osna subject of the Ring of may, residing at Marconi llouse, Strand, London, England, have invented new and useful Improvements in ,\\"ireless-Telegraph Transmitters, of which the following is a specification.

The object of this invention is to provide andhhprovcd wireless telegraph transmitter in which it may be possible to put a very large amount of power into the aerial.

The invention is illustrated in the accompanying drawings, Figure l of which is a diagrammatic "representation of a transmitter arranged in accordance with my invention, while Figs. Band 3 are similar views showing modifications.

1 and 2 are two condensers which are charged from the siiple source of current 3 through incluctances 4,,aud 5 respectively. These condensers discliarge through primary coils ti and 7, quenching arrangements 8 and 9 and a disk discharger 10.

The electrodes it and 12 belonging to the condenser circuits 1, t3. 8 and 2, 7, 9 respectively are so arranged that discharges take place from 11 and 12 to the disk studs alternately at regular intervals and the interval between the commencement. of the discharge of one condenser and the conuncuccnient of the discharge of the next comlcnscrshould be equal to or an exact multiple of the period of the aerial and intermediate closed circuit if any assuming that ti and 7 are wound in the same way; it however they are wound in op umite. ways, the interval should be equal to or an odd multiple of the half pc riod. The primary coils ti and 7 are coupled to a common secondary 13 which forms part. of an aerial circuit.

The inductanecs 'l. 5 should be large compared with the inductmices of the other parts of the circuits. but should of course not be so large as to prevent. the condensers heing sullicicntly charged in the time available.

Fig. 2 shows a. modification in which a singl" inductam e 14 through which both condh nscrs discharge is employed, instead of the two separate iuductances 6 and 7, and this inductance is not coupled directly to the aerial hat to an intermediate oscillating air-nit, 141 which is itself coupled to the aerial.

hfg. 8 shows a modificatioi .n which each discharge circuit lmllldcs a spark gap which is of such a nature that the normal working potential will not spark but which is capable of being ionized by a second or trigger spark, which by reason of thc shortness of its wave length and also hccausc its ircuit; has little interaction with thc other circuits gives more accurate timing than is possible with the dischargcrs in the main circuits.

The main condensers 1 and 2. which are charged l'rom thc high tension hattcry 3 or other source of supply through iuductauces l and 5, discharge through primary coils ti and T, quenching arrangements 5 and U, the secondaries l5 and lti of two small o cillation traust'ornu-rs and clcctrmlc ll amt 1;: respectively to the main dish it).

The quenching arrangements and thc ad justmcnt ot' the electrodes 11 and 1:! are such that the potential of thc condensers l and :3 is not sutlicicut to cause a discharge between it and t1! and the disk It).

Auxiliary or tl'iggcr condensers l7 and 1h, which are small in comparison with 1 and 2, are charged through suitahlc imluclanccs 1E) and 20 from a high tcusioll hattcry 21 or other source of supply. 'lhcsc condensers dischargc through thc primarics 2'. and iil ot' the small oscillation transformers, and electrodes 2! and 2- rcspcctii'cl to a triggcr dish 2a.

This trigger disk is prct'crahly rigidly coupled to thc main dish ltl and thc. clcctrodcs arc arrangcd so that when a stud on It! is opposite it or t! a stud on :36 is opposite .24 or '33 respw'tircly. The main circuits 1, ti. l5 and :2, and tuned to thc ucrial circuit.

The trigger circuits IT n'cl'crahl a very much hlghcr trcqucmgg than the main circuits; thc secondaries and Hi ol' the oscillation transformers are prcl'cralilv shuntcd by small condcnscrs'fid'i, J8 placcd across them and the circuits 15, JT and H 28 are tuned to thc trigger circuits IT, 22 and 1H, 23 respcctivcly.

lnum-diatcli discharges a high potcntial is induced in the oscillation transl'orlmusccondary 15 or lti cau ing a spark at, ll or 12 thus allowing the main condcnscr l or :5 to discharge.

Wherever the phrase "in svnchronism with the aerial is uscd in the following claims, I mean that the intervals between the condcnscr discharges are equal to or a T. it; are hoth coupled.

:3: and 18.23 ha\',

cithcr condenser 17 or 18' multiple of the period of the portion of the transmitter circuits outside of the coupling members, such as 6, 7 or 1-l, through which the condenser discharges.

What I claim is:

1. In a wireless telegraph transmitter, the combination of an aerial, a plurality of circuits each including a condenser and an inductance in series therewith, means separate from said inductances for charging each condenser through its inductance, and means including a quenched spark gap and a movable circuit-making and breaking dcrice for discharging the condensers independently in succession and in synchronism with the aerial.

'2. In a wireless telegraph transmitter, the combination of an aerial, a pluralit of circuits each including a condenser an an inductance in series therewith, means separate from said inductanws for charging each condenser through its inductance, and means including a quenched spark up and a rotary disk dischargcr for disc urging the condensers independently in succession and in synchronism with the aerial.

3. In a wireless telegraph transmitter, the combination of an aerial, a plurality of circuits each includin a condenser and an inductance in series t erewith, means-separate from said inductances for charging each condenser through its inductance, and means including a circuit-making and brealo ing device common to a plurality of said circuits and a quenched spark gap for discharging the condensers independently in succession and in synchronism with the aerial.

4.111 a wireless telegraph transmitter the combination of an aerial, a plurality 0t circuits each includin a condenser and an inductance in series tierewith, means separate from said inductances for charging each condenser through its inductance, and means including a rotar disk .discharger common to a plurality 0 said circuits and a quenched spark gap for discharging the condensers independently in succession and in synchronism with the aerial.

5. In a wireless telegraph transmitter, the combination of an aerial, a plurality of circuits each including a condenser and an inductance in series therewith, meanstseparate from said inductances for charging each condenser through its inductance, means including a quenched spark gap and a movable circuit-making and breaking device for discharging the condenser independently in succession and in synchronism with the aerial, an inductance between each condenser and the circuit making and breaking device, and a winding in the aerial adapted to act as a common secondary to the primaries formed by the last-mentioned inductances.

6. In a wireless telegraph transmitter, the combination of an aerial, a plurality of condensers, an inductance in series with each, condenser, means for charging each condenserindependently througl'i its inductance, a disk discharger, an inductance between each condenser and the discharger, and a winding in the aerial adapted to act; as a common secondary to the primaries formed by the last mentioned inductances.

GUGLIELMO MARCONI.

\Vitnesses:

W. L, MoEwaN, Ix. B. RANSFOKI). 

